civil_time.cc
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1 // Copyright 2018 The Abseil Authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 #include "absl/time/civil_time.h"
16 
17 #include <cstdlib>
18 #include <string>
19 
20 #include "absl/strings/str_cat.h"
21 #include "absl/time/time.h"
22 
23 namespace absl {
24 
25 namespace {
26 
27 // Since a civil time has a larger year range than absl::Time (64-bit years vs
28 // 64-bit seconds, respectively) we normalize years to roughly +/- 400 years
29 // around the year 2400, which will produce an equivalent year in a range that
30 // absl::Time can handle.
31 inline civil_year_t NormalizeYear(civil_year_t year) {
32  return 2400 + year % 400;
33 }
34 
35 // Formats the given CivilSecond according to the given format.
36 std::string FormatYearAnd(string_view fmt, CivilSecond cs) {
37  const CivilSecond ncs(NormalizeYear(cs.year()), cs.month(), cs.day(),
38  cs.hour(), cs.minute(), cs.second());
39  const TimeZone utc = UTCTimeZone();
40  // TODO(absl-team): Avoid conversion of fmt std::string.
41  return StrCat(cs.year(),
42  FormatTime(std::string(fmt), FromCivil(ncs, utc), utc));
43 }
44 
45 } // namespace
46 
47 std::string FormatCivilTime(CivilSecond c) {
48  return FormatYearAnd("-%m-%dT%H:%M:%S", c);
49 }
50 std::string FormatCivilTime(CivilMinute c) {
51  return FormatYearAnd("-%m-%dT%H:%M", c);
52 }
53 std::string FormatCivilTime(CivilHour c) {
54  return FormatYearAnd("-%m-%dT%H", c);
55 }
56 std::string FormatCivilTime(CivilDay c) { return FormatYearAnd("-%m-%d", c); }
57 std::string FormatCivilTime(CivilMonth c) { return FormatYearAnd("-%m", c); }
58 std::string FormatCivilTime(CivilYear c) { return FormatYearAnd("", c); }
59 
60 namespace time_internal {
61 
62 std::ostream& operator<<(std::ostream& os, CivilYear y) {
63  return os << FormatCivilTime(y);
64 }
65 std::ostream& operator<<(std::ostream& os, CivilMonth m) {
66  return os << FormatCivilTime(m);
67 }
68 std::ostream& operator<<(std::ostream& os, CivilDay d) {
69  return os << FormatCivilTime(d);
70 }
71 std::ostream& operator<<(std::ostream& os, CivilHour h) {
72  return os << FormatCivilTime(h);
73 }
74 std::ostream& operator<<(std::ostream& os, CivilMinute m) {
75  return os << FormatCivilTime(m);
76 }
77 std::ostream& operator<<(std::ostream& os, CivilSecond s) {
78  return os << FormatCivilTime(s);
79 }
80 
81 } // namespace time_internal
82 
83 } // namespace absl
std::string FormatTime(const std::string &format, absl::Time t, absl::TimeZone tz)
Definition: format.cc:70
time_internal::cctz::year_t civil_year_t
Definition: civil_time.h:346
std::string StrCat(const AlphaNum &a, const AlphaNum &b)
Definition: str_cat.cc:98
TimeZone UTCTimeZone()
Definition: time.h:1026
Definition: algorithm.h:29
std::ostream & operator<<(std::ostream &os, CivilYear y)
Definition: civil_time.cc:62
time_internal::cctz::detail::civil_time< time_internal::second_tag > CivilSecond
Definition: civil_time.h:323
Time FromCivil(CivilSecond ct, TimeZone tz)
Definition: time.h:1085
std::string FormatCivilTime(CivilSecond c)
Definition: civil_time.cc:47


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autogenerated on Mon Feb 28 2022 21:31:17